/**

 @Name：layui.form 表单组件
 @Author：贤心
 @License：MIT
    
 */
 
 layui.define('layer', function(exports){
    "use strict";
    
    var $ = layui.$
    ,layer = layui.layer
    ,hint = layui.hint()
    ,device = layui.device()
    
    ,MOD_NAME = 'form', ELEM = '.layui-form', THIS = 'layui-this'
    ,SHOW = 'layui-show', HIDE = 'layui-hide', DISABLED = 'layui-disabled'
    
    ,Form = function(){
      this.config = {
        verify: {
          required: [
            /[\S]+/
            ,'必填项不能为空'
          ]
          ,phone: [
            /^1\d{10}$/
            ,'请输入正确的手机号'
          ]
          ,email: [
            /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/
            ,'邮箱格式不正确'
          ]
          ,url: [
            /(^#)|(^http(s*):\/\/[^\s]+\.[^\s]+)/
            ,'链接格式不正确'
          ]
          ,number: function(value){
            if(!value || isNaN(value)) return '只能填写数字'
          }
          ,date: [
            /^(\d{4})[-\/](\d{1}|0\d{1}|1[0-2])([-\/](\d{1}|0\d{1}|[1-2][0-9]|3[0-1]))*$/
            ,'日期格式不正确'
          ]
          ,identity: [
            /(^\d{15}$)|(^\d{17}(x|X|\d)$)/
            ,'请输入正确的身份证号'
          ]
        }
      };
    };
    
    //全局设置
    Form.prototype.set = function(options){
      var that = this;
      $.extend(true, that.config, options);
      return that;
    };
    
    //验证规则设定
    Form.prototype.verify = function(settings){
      var that = this;
      $.extend(true, that.config.verify, settings);
      return that;
    };
    
    //表单事件监听
    Form.prototype.on = function(events, callback){
      return layui.onevent.call(this, MOD_NAME, events, callback);
    };
    
    //初始赋值
    Form.prototype.val = function(filter, object){
      var that = this
      ,formElem = $(ELEM + '[lay-filter="' + filter +'"]');
      formElem.each(function(index, item){
        var itemFrom = $(this);
        layui.each(object, function(key, value){
          var itemElem = itemFrom.find('[name="'+ key +'"]')
          ,type;
          
          //如果对应的表单不存在，则不执行
          if(!itemElem[0]) return;
          type = itemElem[0].type;
          
          //如果为复选框
          if(type === 'checkbox'){
            itemElem[0].checked = value;
          } else if(type === 'radio') { //如果为单选框
            itemElem.each(function(){
              if(this.value === value ){
                this.checked = true
              }     
            });
          } else { //其它类型的表单
            itemElem.val(value);
          }
        });
      });
      form.render(null, filter);
    };
    
    //表单控件渲染
    Form.prototype.render = function(type, filter){
      var that = this
      ,elemForm = $(ELEM + function(){
        return filter ? ('[lay-filter="' + filter +'"]') : '';
      }())
      ,items = {
        
        //下拉选择框
        select: function(){
          var TIPS = '请选择', CLASS = 'layui-form-select', TITLE = 'layui-select-title'
          ,NONE = 'layui-select-none', initValue = '', thatInput
          ,selects = elemForm.find('select')
          
          //隐藏 select
          ,hide = function(e, clear){
            if(!$(e.target).parent().hasClass(TITLE) || clear){
              $('.'+CLASS).removeClass(CLASS+'ed ' + CLASS+'up');
              thatInput && initValue && thatInput.val(initValue);
            }
            thatInput = null;
          }
          
          //各种事件
          ,events = function(reElem, disabled, isSearch){
            var select = $(this)
            ,title = reElem.find('.' + TITLE)
            ,input = title.find('input')
            ,dl = reElem.find('dl')
            ,dds = dl.children('dd')
            ,index =  this.selectedIndex //当前选中的索引
            ,nearElem; //select 组件当前选中的附近元素，用于辅助快捷键功能
            
            if(disabled) return;
            
            //展开下拉
            var showDown = function(){
              var top = reElem.offset().top + reElem.outerHeight() + 5 - $win.scrollTop()
              ,dlHeight = dl.outerHeight();
              
              index = select[0].selectedIndex; //获取最新的 selectedIndex
              reElem.addClass(CLASS+'ed');
              dds.removeClass(HIDE);
              nearElem = null;
  
              //初始选中样式
              dds.eq(index).addClass(THIS).siblings().removeClass(THIS);
  
              //上下定位识别
              if(top + dlHeight > $win.height() && top >= dlHeight){
                reElem.addClass(CLASS + 'up');
              }
              
              followScroll();
            }
            
            //隐藏下拉
            ,hideDown = function(choose){
              reElem.removeClass(CLASS+'ed ' + CLASS+'up');
              input.blur();
              nearElem = null;
              
              if(choose) return;
              
              notOption(input.val(), function(none){
                var selectedIndex = select[0].selectedIndex;
                
                //未查询到相关值
                if(none){
                  initValue = $(select[0].options[selectedIndex]).html(); //重新获得初始选中值
                  
                  //如果是第一项，且文本值等于 placeholder，则清空初始值
                  if(selectedIndex === 0 && initValue === input.attr('placeholder')){
                    initValue = '';
                  };
  
                  //如果有选中值，则将输入框纠正为该值。否则清空输入框
                  input.val(initValue || '');
                }
              });
            }
            
            //定位下拉滚动条
            ,followScroll = function(){  
              var thisDd = dl.children('dd.'+ THIS);
              
              if(!thisDd[0]) return;
              
              var posTop = thisDd.position().top
              ,dlHeight = dl.height()
              ,ddHeight = thisDd.height();
              
              //若选中元素在滚动条不可见底部
              if(posTop > dlHeight){
                dl.scrollTop(posTop + dl.scrollTop() - dlHeight + ddHeight - 5);
              }
              
              //若选择玄素在滚动条不可见顶部
              if(posTop < 0){
                dl.scrollTop(posTop + dl.scrollTop() - 5);
              }
            };
            
            //点击标题区域
            title.on('click', function(e){
              reElem.hasClass(CLASS+'ed') ? (
                hideDown()
              ) : (
                hide(e, true), 
                showDown()
              );
              dl.find('.'+NONE).remove();
            }); 
            
            //点击箭头获取焦点
            title.find('.layui-edge').on('click', function(){
              input.focus();
            });
            
            //select 中 input 键盘事件
            input.on('keyup', function(e){ //键盘松开
              var keyCode = e.keyCode;
              
              //Tab键展开
              if(keyCode === 9){
                showDown();
              }
            }).on('keydown', function(e){ //键盘按下
              var keyCode = e.keyCode;
  
              //Tab键隐藏
              if(keyCode === 9){
                hideDown();
              }
              
              //标注 dd 的选中状态
              var setThisDd = function(prevNext, thisElem1){
                var nearDd, cacheNearElem
                e.preventDefault();
  
                //得到当前队列元素  
                var thisElem = function(){
                  var thisDd = dl.children('dd.'+ THIS);
                  
                  //如果是搜索状态，且按 Down 键，且当前可视 dd 元素在选中元素之前，
                  //则将当前可视 dd 元素的上一个元素作为虚拟的当前选中元素，以保证递归不中断
                  if(dl.children('dd.'+  HIDE)[0] && prevNext === 'next'){
                    var showDd = dl.children('dd:not(.'+ HIDE +',.'+ DISABLED +')')
                    ,firstIndex = showDd.eq(0).index();
                    if(firstIndex >=0 && firstIndex < thisDd.index() && !showDd.hasClass(THIS)){
                      return showDd.eq(0).prev()[0] ? showDd.eq(0).prev() : dl.children(':last');
                    }
                  }
  
                  if(thisElem1 && thisElem1[0]){
                    return thisElem1;
                  }
                  if(nearElem && nearElem[0]){
                    return nearElem;
                  }
         
                  return thisDd;
                  //return dds.eq(index);
                }();
                
                cacheNearElem = thisElem[prevNext](); //当前元素的附近元素
                nearDd =  thisElem[prevNext]('dd:not(.'+ HIDE +')'); //当前可视元素的 dd 元素
  
                //如果附近的元素不存在，则停止执行，并清空 nearElem
                if(!cacheNearElem[0]) return nearElem = null;
                
                //记录附近的元素，让其成为下一个当前元素
                nearElem = thisElem[prevNext]();
  
                //如果附近不是 dd ，或者附近的 dd 元素是禁用状态，则进入递归查找
                if((!nearDd[0] || nearDd.hasClass(DISABLED)) && nearElem[0]){
                  return setThisDd(prevNext, nearElem);
                }
                
                nearDd.addClass(THIS).siblings().removeClass(THIS); //标注样式
                followScroll(); //定位滚动条
              };
              
              if(keyCode === 38) setThisDd('prev'); //Up 键
              if(keyCode === 40) setThisDd('next'); //Down 键
              
              //Enter 键
              if(keyCode === 13){ 
                e.preventDefault();
                dl.children('dd.'+THIS).trigger('click');
              }
            });
            
            //检测值是否不属于 select 项
            var notOption = function(value, callback, origin){
              var num = 0;
              layui.each(dds, function(){
                var othis = $(this)
                ,text = othis.text()
                ,not = text.indexOf(value) === -1;
                if(value === '' || (origin === 'blur') ? value !== text : not) num++;
                origin === 'keyup' && othis[not ? 'addClass' : 'removeClass'](HIDE);
              });
              var none = num === dds.length;
              return callback(none), none;
            };
            
            //搜索匹配
            var search = function(e){
              var value = this.value, keyCode = e.keyCode;
              
              if(keyCode === 9 || keyCode === 13 
                || keyCode === 37 || keyCode === 38 
                || keyCode === 39 || keyCode === 40
              ){
                return false;
              }
              
              notOption(value, function(none){
                if(none){
                  dl.find('.'+NONE)[0] || dl.append('<p class="'+ NONE +'">无匹配项</p>');
                } else {
                  dl.find('.'+NONE).remove();
                }
              }, 'keyup');
              
              if(value === ''){
                dl.find('.'+NONE).remove();
              }
              
              followScroll(); //定位滚动条
            };
            
            if(isSearch){
              input.on('keyup', search).on('blur', function(e){
                var selectedIndex = select[0].selectedIndex;
                
                thatInput = input; //当前的 select 中的 input 元素
                initValue = $(select[0].options[selectedIndex]).html(); //重新获得初始选中值
                
                //如果是第一项，且文本值等于 placeholder，则清空初始值
                if(selectedIndex === 0 && initValue === input.attr('placeholder')){
                  initValue = '';
                };
                
                setTimeout(function(){
                  notOption(input.val(), function(none){
                    initValue || input.val(''); //none && !initValue
                  }, 'blur');
                }, 200);
              });
            }
  
            //选择
            dds.on('click', function(){
              var othis = $(this), value = othis.attr('lay-value');
              var filter = select.attr('lay-filter'); //获取过滤器
              
              if(othis.hasClass(DISABLED)) return false;
              
              if(othis.hasClass('layui-select-tips')){
                input.val('');
              } else {
                input.val(othis.text());
                othis.addClass(THIS);
              }
  
              othis.siblings().removeClass(THIS);
              select.val(value).removeClass('layui-form-danger')
              layui.event.call(this, MOD_NAME, 'select('+ filter +')', {
                elem: select[0]
                ,value: value
                ,othis: reElem
              });
  
              hideDown(true);
              return false;
            });
            
            reElem.find('dl>dt').on('click', function(e){
              return false;
            });
            
            $(document).off('click', hide).on('click', hide); //点击其它元素关闭 select
          }
          
          selects.each(function(index, select){
            var othis = $(this)
            ,hasRender = othis.next('.'+CLASS)
            ,disabled = this.disabled
            ,value = select.value
            ,selected = $(select.options[select.selectedIndex]) //获取当前选中项
            ,optionsFirst = select.options[0];
            
            if(typeof othis.attr('lay-ignore') === 'string') return othis.show();
            
            var isSearch = typeof othis.attr('lay-search') === 'string'
            ,placeholder = optionsFirst ? (
              optionsFirst.value ? TIPS : (optionsFirst.innerHTML || TIPS)
            ) : TIPS;
  
            //替代元素
            var reElem = $(['<div class="'+ (isSearch ? '' : 'layui-unselect ') + CLASS 
            ,(disabled ? ' layui-select-disabled' : '') +'">'
              ,'<div class="'+ TITLE +'">'
                ,('<input type="text" placeholder="'+ placeholder +'" '
                  +('value="'+ (value ? selected.html() : '') +'"') //默认值
                  +(isSearch ? '' : ' readonly') //是否开启搜索
                  +' class="layui-input'
                  +(isSearch ? '' : ' layui-unselect') 
                + (disabled ? (' ' + DISABLED) : '') +'">') //禁用状态
              ,'<i class="layui-edge"></i></div>'
              ,'<dl class="layui-anim layui-anim-upbit'+ (othis.find('optgroup')[0] ? ' layui-select-group' : '') +'">'
              ,function(options){
                var arr = [];
                layui.each(options, function(index, item){
                  if(index === 0 && !item.value){
                    arr.push('<dd lay-value="" class="layui-select-tips">'+ (item.innerHTML || TIPS) +'</dd>');
                  } else if(item.tagName.toLowerCase() === 'optgroup'){
                    arr.push('<dt>'+ item.label +'</dt>'); 
                  } else {
                    arr.push('<dd lay-value="'+ item.value +'" class="'+ (value === item.value ?  THIS : '') + (item.disabled ? (' '+DISABLED) : '') +'">'+ item.innerHTML +'</dd>');
                  }
                });
                arr.length === 0 && arr.push('<dd lay-value="" class="'+ DISABLED +'">没有选项</dd>');
                return arr.join('');
              }(othis.find('*')) +'</dl>'
            ,'</div>'].join(''));
            
            hasRender[0] && hasRender.remove(); //如果已经渲染，则Rerender
            othis.after(reElem);          
            events.call(this, reElem, disabled, isSearch);
          });
        }
        
        //复选框/开关
        ,checkbox: function(){
          var CLASS = {
            checkbox: ['layui-form-checkbox', 'layui-form-checked', 'checkbox']
            ,_switch: ['layui-form-switch', 'layui-form-onswitch', 'switch']
          }
          ,checks = elemForm.find('input[type=checkbox]')
          
          ,events = function(reElem, RE_CLASS){
            var check = $(this);
            
            //勾选
            reElem.on('click', function(){
              var filter = check.attr('lay-filter') //获取过滤器
              ,text = (check.attr('lay-text')||'').split('|');
  
              if(check[0].disabled) return;
              
              check[0].checked ? (
                check[0].checked = false
                ,reElem.removeClass(RE_CLASS[1]).find('em').text(text[1])
              ) : (
                check[0].checked = true
                ,reElem.addClass(RE_CLASS[1]).find('em').text(text[0])
              );
              
              layui.event.call(check[0], MOD_NAME, RE_CLASS[2]+'('+ filter +')', {
                elem: check[0]
                ,value: check[0].value
                ,othis: reElem
              });
            });
          }
          
          checks.each(function(index, check){
            var othis = $(this), skin = othis.attr('lay-skin')
            ,text = (othis.attr('lay-text') || '').split('|'), disabled = this.disabled;
            if(skin === 'switch') skin = '_'+skin;
            var RE_CLASS = CLASS[skin] || CLASS.checkbox;
            
            if(typeof othis.attr('lay-ignore') === 'string') return othis.show();
            
            //替代元素
            var hasRender = othis.next('.' + RE_CLASS[0])
            ,reElem = $(['<div class="layui-unselect '+ RE_CLASS[0]
              ,(check.checked ? (' '+ RE_CLASS[1]) : '') //选中状态
              ,(disabled ? ' layui-checkbox-disbaled '+ DISABLED : '') //禁用状态
              ,'"'
              ,(skin ? ' lay-skin="'+ skin +'"' : '') //风格
            ,'>'
            ,function(){ //不同风格的内容
              var title = check.title.replace(/\s/g, '')
              ,type = {
                //复选框
                checkbox: [
                  (title ? ('<span>'+ check.title +'</span>') : '')
                  ,'<i class="layui-icon layui-icon-ok"></i>'
                ].join('')
                
                //开关
                ,_switch: '<em>'+ ((check.checked ? text[0] : text[1]) || '') +'</em><i></i>'
              };
              return type[skin] || type['checkbox'];
            }()
            ,'</div>'].join(''));
  
            hasRender[0] && hasRender.remove(); //如果已经渲染，则Rerender
            othis.after(reElem);
            events.call(this, reElem, RE_CLASS);
          });
        }
        
        //单选框
        ,radio: function(){
          var CLASS = 'layui-form-radio', ICON = ['&#xe643;', '&#xe63f;']
          ,radios = elemForm.find('input[type=radio]')
          
          ,events = function(reElem){
            var radio = $(this), ANIM = 'layui-anim-scaleSpring';
            
            reElem.on('click', function(){
              var name = radio[0].name, forms = radio.parents(ELEM);
              var filter = radio.attr('lay-filter'); //获取过滤器
              var sameRadio = forms.find('input[name='+ name.replace(/(\.|#|\[|\])/g, '\\$1') +']'); //找到相同name的兄弟
              
              if(radio[0].disabled) return;
              
              layui.each(sameRadio, function(){
                var next = $(this).next('.'+CLASS);
                this.checked = false;
                next.removeClass(CLASS+'ed');
                next.find('.layui-icon').removeClass(ANIM).html(ICON[1]);
              });
              
              radio[0].checked = true;
              reElem.addClass(CLASS+'ed');
              reElem.find('.layui-icon').addClass(ANIM).html(ICON[0]);
              
              layui.event.call(radio[0], MOD_NAME, 'radio('+ filter +')', {
                elem: radio[0]
                ,value: radio[0].value
                ,othis: reElem
              });
            });
          };
          
          radios.each(function(index, radio){
            var othis = $(this), hasRender = othis.next('.' + CLASS), disabled = this.disabled;
            
            if(typeof othis.attr('lay-ignore') === 'string') return othis.show();
            hasRender[0] && hasRender.remove(); //如果已经渲染，则Rerender
            
            //替代元素
            var reElem = $(['<div class="layui-unselect '+ CLASS 
              ,(radio.checked ? (' '+CLASS+'ed') : '') //选中状态
            ,(disabled ? ' layui-radio-disbaled '+DISABLED : '') +'">' //禁用状态
            ,'<i class="layui-anim layui-icon">'+ ICON[radio.checked ? 0 : 1] +'</i>'
            ,'<div>'+ function(){
              var title = radio.title || '';
              if(typeof othis.next().attr('lay-radio') === 'string'){
                title = othis.next().html();
                othis.next().remove();
              }
              return title
            }() +'</div>'
            ,'</div>'].join(''));
  
            othis.after(reElem);
            events.call(this, reElem);
          });
        }
      };
      type ? (
        items[type] ? items[type]() : hint.error('不支持的'+ type + '表单渲染')
      ) : layui.each(items, function(index, item){
        item();
      });
      return that;
    };
    
    //表单提交校验
    var submit = function(){
      var button = $(this), verify = form.config.verify, stop = null
      ,DANGER = 'layui-form-danger', field = {} ,elem = button.parents(ELEM)
      
      ,verifyElem = elem.find('*[lay-verify]') //获取需要校验的元素
      ,formElem = button.parents('form')[0] //获取当前所在的form元素，如果存在的话
      ,fieldElem = elem.find('input,select,textarea') //获取所有表单域
      ,filter = button.attr('lay-filter'); //获取过滤器
     
      
      //开始校验
      layui.each(verifyElem, function(_, item){
        var othis = $(this)
        ,vers = othis.attr('lay-verify').split('|')
        ,verType = othis.attr('lay-verType') //提示方式
        ,value = othis.val();
        
        othis.removeClass(DANGER);
        layui.each(vers, function(_, thisVer){
          var isTrue //是否命中校验
          ,errorText = '' //错误提示文本
          ,isFn = typeof verify[thisVer] === 'function';
          
          //匹配验证规则
          if(verify[thisVer]){
            var isTrue = isFn ? errorText = verify[thisVer](value, item) : !verify[thisVer][0].test(value);
            errorText = errorText || verify[thisVer][1];
            
            //如果是必填项或者非空命中校验，则阻止提交，弹出提示
            if(isTrue){
              //提示层风格
              if(verType === 'tips'){
                layer.tips(errorText, function(){
                  if(typeof othis.attr('lay-ignore') !== 'string'){
                    if(item.tagName.toLowerCase() === 'select' || /^checkbox|radio$/.test(item.type)){
                      return othis.next();
                    }
                  }
                  return othis;
                }(), {tips: 1});
              } else if(verType === 'alert') {
                layer.alert(errorText, {title: '提示', shadeClose: true});
              } else {
                layer.msg(errorText, {icon: 5, shift: 6});
              }
              if(!device.android && !device.ios) item.focus(); //非移动设备自动定位焦点
              othis.addClass(DANGER);
              return stop = true;
            }
          }
        });
        if(stop) return stop;
      });
      
      if(stop) return false;
      
      var nameIndex = {}; //数组 name 索引
      layui.each(fieldElem, function(_, item){
        item.name = (item.name || '').replace(/^\s*|\s*&/, '');
        
        if(!item.name) return;
        
        //用于支持数组 name
        if(/^.*\[\]$/.test(item.name)){
          var key = item.name.match(/^(.*)\[\]$/g)[0];
          nameIndex[key] = nameIndex[key] | 0;
          item.name = item.name.replace(/^(.*)\[\]$/, '$1['+ (nameIndex[key]++) +']');
        }
        
        if(/^checkbox|radio$/.test(item.type) && !item.checked) return;      
        field[item.name] = item.value;
      });
   
      //获取字段
      return layui.event.call(this, MOD_NAME, 'submit('+ filter +')', {
        elem: this
        ,form: formElem
        ,field: field
      });
    };
  
    //自动完成渲染
    var form = new Form()
    ,$dom = $(document), $win = $(window);
    
    form.render();
    
    //表单reset重置渲染
    $dom.on('reset', ELEM, function(){
      var filter = $(this).attr('lay-filter');
      setTimeout(function(){
        form.render(null, filter);
      }, 50);
    });
    
    //表单提交事件
    $dom.on('submit', ELEM, submit)
    .on('click', '*[lay-submit]', submit);
    
    exports(MOD_NAME, form);
  });
  
   
  